Abstract:
Previous studies have shown that quinoxaline (Q) oxidation with electrochemically regenerated KMnO4, with
the formation of pyrazine-2,3-dicarboxylic acid (PDCA), is possible using Pt, Ni, stainless steel and Cu electrodes. In
order to improve current knowledge and to expand the variety of electrodes used for the pyrazine-2,3-dicarboxilic acid
(PDCA) production process, we investigated the behavior of the copper alloy anodes – brass and bronze. A laboratory
electrolyser for PDCA synthesis with copper alloy anode was manufactured. Depending on the anode – copper, brass and
bronze - the effect of various parameters on the current and substance efficiencies was investigated. These parameters are:
anodic current density, amount of electricity, temperature and initial concentration of quinoxaline. The best performances
of this electrolyser are ~88% current efficiencies on the brass electrode and up to 80% substance efficiencies on the bronze
electrode, at a current density of 3,5 A/dm2. These performances are greater than those obtained on the copper anode.
Keywords:
pyrazine-2,3-dicarboxylic acid, quinoxaline, copper alloy anodes, current efficiencies, substance efficiencies
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